The MD650A-13 is a Async RS232 RS422 RS485 extender fiber Terminal Block ST SM. Use fiber instead of copper to send your RS-232, RS-422, and RS-485 data-and do so without having to route it through protocol converters. Universal Fiber Optic Line Driver Transceivers also offer a wide range of speeds and distances-up to 21.75 miles (35 km) with the single-mode version.
Universal Fiber Optic Line Driver Transceivers enable you to transmit and receive the signals over fiber optic cabling in both point-to-point or drop-and-repeat topologies. You can even mix protocols. For instance, you can set one transceiver to interface with an RS-232 device at one end and another to interface with an RS-485 device at the opposite end. There's no need for a converter box at either end of the fiber link!
Note: Must be used in pairs.